Screw-plate.



No. 664,5!4. Patented Dec. 25, I900. Z. G. WARD.

SCREW PLATE.

(Application filed Oct. 16, 1900.}

(No Model.)

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UNITED STATES PATENT OFFICE.

ZIBA G. WARD, OF PROFFIT, VIRGINIA.

SCREW -PLATE.

SPECIFICATION forming part of Letters Patent No. 664,514, dated December25, 1900.

Application filed October 16, 1900. Serial No. 33,187. (No model.)

To all whom it may concern.-

Be it known that I, ZIBA G. WARD, a citizen of the United States,residing at Proflit, in the county of Albernarle and State of Virginia,have invented certain new and useful Improvements in Screw- Plates; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to screw-plates; and it consists in the novelconstruction and combination of the parts hereinafter fully describedand claimed.

In the drawings, Figure l is a plan view of the screw-plate. Fig. 2 is aside View, and Fig. 3 is an end view, of the same.

The screw-plate is made of two parts A and B, which are reversible, andeach part is provided with screwcutting threads I) on its edges. Thepart- A is provided with two projecting lugs c and c at one end. Thepart B has a handle D at one end, provided with projecting lugs d andcl, which overlap the lugs on the part A according to the position ofthe two parts. i

E is a pivot-pin which connects the lug d to the lug c. When the parts Aand B are reversed, the same pivot-pin is used to connect the lug d tothe lug c.

F is a forked bracket which is pivoted to the opposite end portion ofthe part B from the handle D by a pin f. The bracket F straddles thefree end of the part A and is provided with a thumb-screw g for pressingthe part A edgewise toward the part B.

G is a cranked handle secured to the part A and projecting across theforked bracket. When the parts A and B are reversed, the forked bracketis swung over on its pivot, so as to engage with the part A when pivotedon the other side of the part B. The cuttingthreads 1) are of varioussizes and are arranged to come together in pairs.

What I claim is- 1. In a screw-plate, the combination,.with tworeversible parts having cutting-threads on their edges, of a pivotconnecting the said parts at one end, and a forked bracket pivoted tothe other end of one of the said parts and provided with a screw forpressing the two parts together, substantially as set forth.

" 2. In a screw-plate, the combination, with portion of one part andoverlapping the other part in each of its positions, a pin for pivotingthe said handle to the other part, a cranked handle secured to one ofthe said parts, and a forked bracket pivoted to one of the parts at theother end thereof from its pivot and provided with a screw for pressingthe two parts together, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ZIBA c. WARD.

Witnesses:

WM. F. LONG, W. P. GLEASON.

